For many years, the largest sown areas in the Republic of Tatarstan have been devoted to spring wheat. Revealing the effect of biological preparations on growth processes, plant resistance to unfavorable conditions and stresses is an important issue in the cultivation technology within the framework of biological agriculture. In studies conducted in 2018-2019 with the Ulyanovskaya 100 spring wheat variety, biological fungicides and an adaptogen were used to increase resistance to adverse conditions from the collection of the Kazan State Agrarian University. The complex use of biological fungicides in the conditions of gray forest soils made it possible to increase the yield of spring wheat by 10.6 %, and the combined use of biological fungicides and an adaptogen contributed to an increase in the yield to 15.2 %.
It remains relevant to meet the needs of plants in nutrients, methods of using growth stimulants, considering the active phases of culture development. The purpose of our research is to study the complex effect of the level of mineral nutrition, pre-sowing treatment of seeds, and spraying growing plants with a growth regulator on the productivity of spring wheat. Laboratory research and field experiments were carried out in 2019–2020 based on the Federal State Budgetary Educational Institution in the field of Higher Education "Kazan State Agrarian University" on gray forest soil. The average yield of spring wheat over the years of research against the background without fertilizers was 3.94 t/ha, against the background of NPK to obtain 3.5 t/ha of grain – 4.53 t/ha, against the background of NPK to obtain 4.5 t/ha of grain – 5.24 t/ha. The complex use of growth stimulants during pre-sowing seed treatment and double spraying in the tillering phase and spring wheat into the tube contributed to an increase in yield in all nutritional backgrounds by another 4.9–6.3 %.
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